Thin Film High-Temperature Superconducting Flux Transformers Coupled to SQUIDs
Using photolithographic patterning and laser deposition, we have constructed a sensitive thin-film SQUID magnetometer from YBa2Cu3O7−x (YBCO). The device consists of a flux transformer, deposited on one substrate, which is coupled to a thin-film YBCO SQUID, made with bi-epitaxial junctions, deposited on another substrate. At 77K, the magnetometer has attained a sensitivity of 1.8pTHz−1/2 at 1Hz, and has been used to measure the magnetic signal from the human heart.
KeywordsCritical Current Density Seed Layer Magnetic Signal Shadow Mask Pickup Coil
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- F.C. Wellstood, J. J. Kingston, M. J. Ferrari and J. Clarke, Appi. Phys. Lett. 57, 1930 (1990)Google Scholar
- K. Char, M. S. Colclough, S. M. Garrison, N. Newman and G. Zaharchuk, (to be published in Appi. Phys. Lett.).Google Scholar
- A.H. Miklich, J.J. Kingston, F.C. Wellstood, J. Clarke, M.S. Colclough, K. Char and G. Zaharchuk, (to be published in Appi. Phys. Lett.).Google Scholar
- L. Lee et al, (unpublished).Google Scholar